Bug 968036 (CVE-2013-2850)

Summary:	CVE-2013-2850 kernel: iscsi-target: heap buffer overflow on large key error
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	bhu, iboverma, jkacur, lgoncalv, mcressma, security-response-team, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-20 10:38:49 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	968038, 968039, 969272
Bug Blocks:	968040

Description Petr Matousek 2013-05-28 20:19:05 UTC

A flaw was found in the way Linux kernel's iSCSI target processed large keys. If a key was larger than 64 bytes, as checked by iscsi_check_key(), the error response packet, generated by iscsi_add_notunderstood_response(), would still attempt to copy the entire key into the packet, overflowing the structure on the heap.

A remote attacker could use this flaw to escalate their privileges on the system.

Acknowledgements:

Red Hat would like to thank Kees Cook for reporting this issue.

Comment 1 Petr Matousek 2013-05-28 20:19:58 UTC

Statement:

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5 and 6 as those versions do not provide support for in-kernel iSCSI target.

Future kernel updates in Red Hat Enterprise Linux MRG 2 may address this flaw.

Comment 5 Petr Matousek 2013-05-31 06:17:31 UTC

Created kernel tracking bugs for this issue

Affects: fedora-all [bug 969272]

Comment 6 Petr Matousek 2013-05-31 06:21:29 UTC

Upstream fix:

http://git.kernel.org/cgit/linux/kernel/git/nab/target-pending.git/commit/?id=cea4dcfdad926a27a18e188720efe0f2c9403456

Comment 7 Fedora Update System 2013-06-07 04:33:12 UTC

kernel-3.9.4-301.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 Fedora Update System 2013-06-13 06:04:33 UTC

kernel-3.9.5-201.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 Fedora Update System 2013-07-01 01:33:53 UTC

kernel-3.9.8-100.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 10 errata-xmlrpc 2013-09-16 17:05:01 UTC

This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2013:1264 https://rhn.redhat.com/errata/RHSA-2013-1264.html